Improved prediction of all-cause mortality by a combination of serum total testosterone and insulin-like growth factor i in adult men

Nele Friedrich, Harald J. Schneider, Robin Haring, Matthias Nauck, Henry Völzke, Heyo K. Kroemer, Marcus Dörr, Jens Klotsche, Caroline Jung-Sievers, David Pittrow, Hendrik Lehnert, Winfried März, Lars Pieper, Hans Ulrich Wittchen, Henri Wallaschofski, Günter K. Stalla

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7 Citations (Scopus)

Abstract

Objective: Lower levels of anabolic hormones in older age are well documented. Several studies suggested that low insulin-like growth factor I (IGF-I) or testosterone levels were related to increased mortality. The aim of the present study was to investigate the combined influence of low IGF-I and low testosterone on all-cause mortality in men. Methods and results: From two German prospective cohort studies, the DETECT study and SHIP, 3942 men were available for analyses. During 21,838 person-years of follow-up, 8.4% (n = 330) of men died. Cox model analyses with age as timescale and adjusted for potential confounders revealed that men with levels below the 10th percentile of at least one hormone [hazard ratio (HR) 1.38 (95% confidence-interval (CI) 1.06-1.78), p = 0.02] and two hormones [HR 2.88 (95% CI 1.32-6.29), p < 0.01] showed a higher risk of all-cause mortality compared to men with non-low hormones. The associations became non-significant by using the 20th percentile as cut-off showing that the specificity increased with lower cut-offs for decreased hormone levels. The inclusion of both IGF-I and total testosterone in a mortality prediction model with common risk factors resulted in a significant integrated discrimination improvement of 0.5% (95% CI 0.3-0.7%, p = 0.03). Conclusions: Our results prove that multiple anabolic deficiencies have a higher impact on mortality than a single anabolic deficiency and suggest that assessment of more than one anabolic hormone as a biomarker improve the prediction of all-cause mortality.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalSteroids
Volume77
Issue number1-2
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

Keywords

  • DETECT
  • IGF-I
  • Mortality
  • Study of Health in Pomerania (SHIP)
  • Testosterone

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